metamorphic
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, actinolite, and epidote)
Hardness: 3.5-5 (Mohs), Color: Dull to dark green or grayish-green, Luster: Silky to dull, Crystal Structure: Foliated or massive, Specific Gravity: 2.8-3.0
- Hardness
- 3
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Physical properties
Hardness: 3.5-5 (Mohs), Color: Dull to dark green or grayish-green, Luster: Silky to dull, Crystal Structure: Foliated or massive, Specific Gravity: 2.8-3.0
Formation & geological history
Formed by low-grade regional metamorphism of mafic igneous rocks (like basalt) at low temperatures and pressures. Often associated with ancient oceanic crust and subduction zones.
Uses & applications
Traditionally used for carving ornamental objects, axe heads in the Neolithic period, and sometimes as construction aggregate or garden stone.
Geological facts
The green color is primarily due to the presence of chlorite and epidote. This stone is a key marker for geologists studying ancient tectonic plate movements and regional metamorphism.
Field identification & locations
Identify by its characteristic green hue and fine-grained, slightly foliated texture. Commonly found in mountain belts and areas with exposed metamorphic bedrock.
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